Filling cutting device for a weaving machine

ABSTRACT

The invention relates to a filling cutting device on a weaving machine with filling insertion from a supply package outside of the warp shed, said filling cutting device being actuated synchronously with the movement of filling insertion members movable in relation to each other, each one provided with a cutting edge, the one of which is situated at the edge of a catching recess for the filling yarn of one cutter member and so oriented as to function with either of two types of pick insertion.

ilnited States Patent Inventors Appl. No.

Filed Patented Assignee Priority Anton Egloff Oskar Bernath, Umiken,both of Switzerland Sept. 2, 1970 Nov. 23, 1971 Georg Fischer A. G.Brugg Brugg, Switzerland Nov. 21, 1969 Switzerland FILLING CUTTINGDEVICE FOR A WEAVING MACHKNE 4 Claims, 7 Drawing Figs.

US. Cl 139/122 R, 139/127 R, 139/302 llnt. Cl D0311 47/36 [50] FieldofSearch 139/116. 122R,123.124R,124A,125,126.127 R; 302, 303

[56] References Cited UNITED STATES PATENTS 3,225 794 12/1965 Juillard139/303 3530902 9/1970 Stingl 139/302 Primary Examiner-Henry S. .laudonAnorney- Rodney C. Southworth ABSTRACT: The invention relates to afilling cutting device on a weaving machine with filling insertion froma supply package outside of the warp shed, said filling cutting devicebeing actuated synchronously with the movement of filling insertionmembers movable in relation to each other each one provided with acutting edge, the one of which is situated at the edge of a catchingrecess for the filling yarn of one cutter member and so oriented as tofunction with either of two types of pick insertion.

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INVHNTORS ANTON EGLOFF OSKAR BE RNAT H AT TORNE Y BACKGROUND OF THEINVENTION For weaving machines with pick and pick filling insertion, twobasic insertion systems are known by which the insertion of the fillinginto the warp shed is effected by means of an inserting carrier and awithdrawing carrier entering the warp shed from opposite sides, meetingeach other in the middle of the shed for the filling transfer andthereafter, returning to their basic position.

That one of the systems known as a loop insertion system, is based on afilling thread leading from one of the cloth selvages to a package beingcaught by an inserting carrier provided with guiding surfaces, whichcarrier extends the thread in the form of a loop which is sliding overthe guiding surfaces up to the middle of the cloth, where it is takenover by the cooperating carrier. At a properly timed moment in thetransfer of the loop, the filling part connected to the cloth selvage iscut at the selvage, whereupon the withdrawing carrier pulls out the cutfilling over the remaining half of the cloth.

With the other system, known as tip insertion system, the filling yarnextending from the cloth selvage to the supply package is caught by aninserting carrier provided with a clamping device. The filling is cut atthe selvage not later than at the moment when the inserting carrierenters the warp shed, so that the free tip of the pick is carried aheadinto the shed. In the middle of the cloth the tip of the pick istransferred to and clamped by the withdrawing carrier which has enteredthe shed from the opposite side. On the reverse movement of thewithdrawing carrier the pick is pulled out, again with its tip ahead,over the other half of the cloth.

Both aforementioned systems require for their accomplishment differentmeans of filling control. Correspondingly, different filling cuttingdevices have been used so far. It is a purpose of this inventiontherefore, to develop a filling cutting device which can be used forboth the loop insertion system and for the tip insertion systems.

Filling cutting devices of the prior art are known (such as, e.g., SwissPat. No. 464,106) on which the cutting edges stand vertical and normalto the direction of filling insertion. A disadvantage in the case of thetip insertion system is that the filling thread which leads from thecloth selvage to the supply package can only get between the cuttingedges when the inserting carrier has already entered the shed over aconsiderable distance, as only then is the filling part near the selvageat right angles to the cutting edges. Furthermore, considerable cost andeffort are involved to achieve a perfect and lasting cutting qualitybecause the cutting faces standing opposite to each other must be hollowground to obtain a three-point contact.

SUMMARY OF THE INVENTION With a view to accomplishing these desiredresults and to the elimination of the aforementioned disadvantages, thefilling cutter according to the inventive idea is so designed that acatching recess can be turned away from the warp shed with its threadreceiving opening pointing to the side of the filling insertion and thatthe two cutting edges are situated in a plane virtually parallel to thefilling insertion movement.

The drawings show by way of example one configuration of the inventiveobject wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a fillingcontrol motion to illustrate the function of the inventive fillingcutting device for a loop insertion system,

FIG. 2 is a plan view of a filling control motion to illustrate thefunction of the inventive filling cutting device for a tip insemensystem,

FIG. 3 is a side view of the filling cutting device seen from the sideof the cloth, showing the device in the position ready to cut,

FIG. 4 is a front view of the cutting part of the filling cutting devicein a position to cut,

FIG. 5 is a horizontal section across the bearing of the filling cutter,

FIG. 6 is a front view of the cutting part of an alternative meansapplicable to the filling cutting device incorporating a thread guide,and

FIG. 7 is a side view of the cutting part of the filling cutting deviceshown in FIG. 6, seen from the opposite side to FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. I shows a plan view of afilling control motion of a shuttleless weaving machine for single pickinsertion by means of an inserting carrier and a withdrawing carrierwith a schematic view of the filling cutting device as employed for theloop insertion system. Among parts shown is a girt 1 of the loom whichis not shown in detail, on which is mounted a control housing 2 with acontrol shaft 6 borne in two bearings 3. The control shaft 6 is drivenby means (not shown) synchronously with the movements of thereciprocating insertion members 4 and is equipped with a plurality ofcams 5.

The control movements of the rotating cams 5 are transferred to pushingrods 9, 10, I1 and 12 which are each provided with a cam followingroller 7, said pushing rods being horizontally movable in guides in abar 13. The pushing rod 9 is provided with teeth 14 which mesh with apinion 15 mounted on a pinion shaft 18 which is borne in bearings 16 and17. This pinion shaft 18 operatively supports the filling cutting devicewhich as a whole is identified with numeral 19. An extension 20 of thepinion shaft 18 pointing toward the cloth, allows setting the fillingcutting device 19 to the required cloth width. The filling cuttingdevice 19 is arranged on the pinion shaft 18 so that its cutter members21 and 22 can move up and down outside the warp ends 23 of the groundcloth, i.e., adjacent to the cloth selvage 24.

The pushing rods 10, 11 act upon a filling depressor 28 via double lever26 provided with rollers and linked in bearings 27, the purpose of saidfilling depressor 28 being to bring the filling yarn 29 from ahorizontal position into an approximate- Iy vertical position which issuitable for the inserting carrier 30 of the filling insertion member 4for taking over the filling. The rollers 25 are pressed against thepushing rods l0 and 11, respectively, by traction springs (not shown).

The further pushing rod 12 is in contact with a rod 33 being movable inguides 31, provided with a presser 32 and spring loaded against thepushing rod 12 by means of the compression spring 34. The presser 32acts upon a filling clamp 35, consisting of two flat springs 37 fixed intwo studs 36 and of a counter stud 38.

Furthermore, there are a sley sword 39, a sley 40 with a reed 41 and arace board 42 to support the warp ends 23 and the flexible-type tapefilling insertion member 4 running in the tape guide 43. The insertionmember 4 has fixed at its end an inserting carrier of known form. Also,an opposed and similar withdrawing tape member (not shown) has fixed atits end a withdrawing carrier, these also being known in the art.

The filling threads 45 which together with the warp ends 23 form thecloth 44, have free ends 46 at the cloth selvage 24. The pick 47 whichhas last been beaten up by the reed 41 runs in a loop 48 formed by thefilling yarn 29 and leads from the cloth selvage 24 via the fillingcutting device 19, the inserting carrier 30, the filling positioner 49,the filling clamp 35 and the eyelet 50 in the protection shield to thefilling yarn supply package 52.

The cutting of the filling yarn 29 by the cutting device 19 takes placeat the moment when a withdrawing carrier 53 upon entering the insertingcarrier 30 in the middle of the cloth 44 has taken over the filling yarn29. This timing is given by the setting of the cam 5 controlling thepushing rod 9. The loop is then straightened out extending the cut endto the other side of the cloth.

FIG. 2 is a plan view showing a corresponding filling control motionwith a similar filling cutting device 19 in function with the tipinsertion system. The general arrangement is identical with FIG. 1except for an appropriately shaped inserting carrier 30 with thread endclamping device 54 and a withdrawing carrier 53' with a thread endholding device 55.

The cutting of the filling yarn 29 connected with the last beaten-uppick 47, leading around the filling cutting device 19 and being clampedin the thread clamping device 54 of the inserting carrier 30, takesplace at the moment shown in FIG. 2, i.e., when the thread clampingpoint 56 just enters the shed, or in other words, has reached theoutermost warp ends 23. This timing is given by the setting of the camactuating the cutting device which is changed as compared with thesetting of the cam as per FIG. 1 (loop insertion system).

FIGS. 3, 4 and 5 demonstrate the construction of the filling cuttingdevice 19 shown in the position ready to cut. The cutter member 21 isfirmly mounted on the shaft 18 by means of screw 58 located in thecutter member hub 60. The shaft 18 is situated above the cloth 44 andcan be oscillated in directions of the arrow 57 by a pinion drive asshown in FIG. 1 or by other suitable means (not shown or describedhere). By oscillating in the direction of the arrow 57, the fillingcutting device 19 can take a position ready to cut as drawn in fulllines, or a rest position as indicated by the dot and dash line 59, FIG.3. Another cutter member 22 is rotatably borne on a sleeve 60', adjacentto the cutter member 21. The hub 64 of the cutter member 22 is radiallyguided by means of needle bearings 76 on sleeve 60 which extendslaterally from the hub 60. An adjusting collar 78 clamped on the sleeve60' by means of a set screw 77 secures the hub 64 and also the cuttermember 22, against axial displacement. When the screw 58 is loosened thewhole filling cutting device 19 can be moved along the shaft 18.

The cutter member 22 is provided with a stud 61 on which is mounted atorsion spring 62, the one end 63 of which is rested against the hub 64of the cutter member 22. The other end 65 of the spring presses againststud 66 which is firmly connected with the cutter member 21 and whichextends through a slot 67 in the cutter member 22, whereby the cuttermember 21 takes an upper position in relation to the cutter member 22determined by the stop position of the stud 66 in the upper end of theslot 67.

By lowering the filling cutting device 19 from the rest position 59 intothe drawn or full line position ready to cut, a nose 68 on the hub 64 ofthe cutter member 22 comes to rest against a stationary stop 69 andprevents a further downward movement of the cutter member 22. By furtherturning of the shaft 18 a cutting blade 73 with a cutting edge 73 ismoved downwards against the cutting edge 74 and past it, said cuttingblade 73 being rotatably borne in a fork 70 of the cutter member 21 andbeing pressed against the cutter part 72 of the cutter member 22 bymeans of a flat spring 71. Thus the cutting process of the fillingcutting device 19 is carried out.

By turning the shaft 18 or the filling cutting device 19, respectively,clockwise (FIG 3) the cutter is brought back from its cutting positionin the drawn position, ready to cut, and thereafter, again back to restposition 59.

As can be seen particularly from FIG. 4, the cutter part 72 is providedon a part of the cutter member 22 which is at right angles to thelongitudinal direction of the cutter members 21, 22 or parallel to thedirection of filling insertion, respectively. The cutter part 72 isprovided with an approximately U- shaped catching recess 75 with itsclosed part against the cloth and its open part pointing toward thefilling supply side, into which the filling thread 29 held back by theselvage 24 is guided soon after it has been caught by the insertingcarrier 30 or 30'. The cutting edge 74 at the lower end of the catchingrecess 75 and the cutting edge 73a at the lower end of the cutting part73 are approximately parallel to the direction of filling insertion.This above-described arrangement allows by way of choice, effectivecutting of the filling thread in the position of the inserting carrieras in FIG. 1 in the case of loop insertion, or in the position of theinserting carrier 30 as in FIG. 2 in the case of tip insertion.

As an alternative the cutting part ofthe filling cutting device 19 shownin FIGS. 6 and 7 is provided with a thread uide 79. This thread guide 79extends from the cutting edge 4 and is tilted downwards. Its purpose isto guide heavy and sagging filling 29 safely into the catching recess 75of the filling cutting device 19, as indicated by 29' in FIG. 6.Furthermore, a plate 81 can be fastened by means of screws to the cuttermember 22 opposite the cutting part 73 and provided with a recesssimilar to the catching recess 75, however, with its lower edge 82 andside edge 83 projecting over the cutting edge 74. This is a particularadvantage when using certain delicate filling yarns 29, as it preventsthe filling yarn from contacting the cutting edge 74 prior to the actualcutting process. It is also possible to have the plate 81 and the threadguide 79 made in one piece.

This disclosure of a preferred embodiment of the invention is to beinterpreted as illustrative of forms the invention may take andmodifications will readily occur to those skilled in the art. Theinvention is not to be restricted except by the scope of the appendedclaims wherein the novel features desired to be protected by LettersPatent are set forth.

What is claimed is:

l. A filling cutting device for a weaving machine in which filling isinserted from a stationary source of filling located outside the shed ofa fabric being woven and in which weaving machine reciprocable fillingcarriers are provided to draw filling from the supply and to insert itas single picks in a warp shed as the fabric is being woven,characterized in that, the cutter comprises two members, an oscillatableshaft on which said members are carried, one said member being fixed foroscillation with the shaft and the other being mounted for restrictedrotation relative to the shaft, connecting means between the two membersimparting movement of the member fixed to the shaft to the other memberthrough a limited angular extent, that member also having a yarncatchingrecess at its end adjacent the point where filling is picked up by acarrier and at which the carrier and filling enter the shed, said recessbeing closed on the side of the warp thread and open toward thatdirection from which the filling is drawn, a cutting edge at one half ofthe yarn recess, the first member fixed to the shaft having a cutterblade and means for urging that blade into a cutting engagement with thecutting edge of the recess, cutting edges of both blade and recess lyingin a plane parallel to the direction of pick insertion.

2. A filling cutting device according to claim 1, characterized by athread guide (79) arranged at the catching recess (75) in extension ofthe cutting edge (74).

3. A filling cutting device according to claim 1, characterized in thata plate (81) is fastened to the cutter member (22) in the range of thecatching recess (75) having a guiding edge (82, 83) projecting over thecutting edge (74).

4. A filling cutting device according to claim 1, characterized in thata cutting part (73) is pivotably borne at the one cutter member (21) andis provided with a cutting edge (73a) and pressed by a spring (71)against the other cutter member (22) provided with a catching recess(75), whereby the pivoting axis of the cutting part (73) is parallel tothe shaft (18).

1. A filling cutting device for a weaving machine in which filling isinserted from a stationary source of filling located outside the shed ofa fabric being woven and in which weaving machine reciprocable fillingcarriers are provided to draw filling from the supply and to insert itas single picks in a warp shed as the fabric is being woven,characterized in that, the cutter comprises two members, an oscillatableshaft on which said members are carried, one said member being fixed foroscillation with the shaft and the other being mounted for restrictedrotation relative to the shaft, connecting means between the two membersimparting movement of the member fixed to the shaft to the other memberthrough a limited angular extent, that member also having ayarn-catching recess at its end adjacent the point where filling ispicked up by a carrier and at which the carrier and filling enter theshed, said recess being closed on the side of the warp thread and opentoward that direction from which the filling is drawn, a cutting edge atone half of the yarn recess, the first member fixed to the shaft havinga cutter blade and means for urging that blade into a cutting engagementwith the cutting edge of the recess, cutting edges of both blade andrecess lying in a plane parallel to the direction of pick insErtion. 2.A filling cutting device according to claim 1, characterized by a threadguide (79) arranged at the catching recess (75) in extension of thecutting edge (74).
 3. A filling cutting device according to claim 1,characterized in that a plate (81) is fastened to the cutter member (22)in the range of the catching recess (75) having a guiding edge (82, 83)projecting over the cutting edge (74).
 4. A filling cutting deviceaccording to claim 1, characterized in that a cutting part (73) ispivotably borne at the one cutter member (21) and is provided with acutting edge (73a) and pressed by a spring (71) against the other cuttermember (22) provided with a catching recess (75), whereby the pivotingaxis of the cutting part (73) is parallel to the shaft (18).